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This comet appears to be fading. I imaged it this morning (April 11.14) and I get a total magnitude of 9.6 and coma diameter of 2.3′ using comphot on the green pixels vs Gaia DR3. My last measurement was on April 9.14 when I got mag 8.6 and 3.0′. Some of this will be the brighter sky due to the Moon but the comet is also fainter in my 9 arcsec aperture photometry.
The attached plot shows 9 arcsec photometry from myself, Denis Buczynski and Peter Carson. Shortly after discovery the magnitude rose rapidly but it is now fading. Total magnitudes are shown on the COBS lightcurve here:
There is a huge amount of scatter on these from different observers. To see a trend you need to look at the results from a single observer using the same equipment and method. Mine are here:
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My image taken on the morning of 20250410 from Tarbatness Highland Scotland.
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The press (or at least the Guardian) has caught on to this. They are asking for readers’ images of 2025 F2: https://www.theguardian.com/science/2025/apr/10/share-your-pictures-of-the-comet-c2025-f2-swan
Time was when it was hard to get the national press to cover an eclipse, but now its bizarre which astronomical happenings (or non-events) they will run with: a mag. 9 comet hard to see from the UK in morning twilight. I suppose they can’t claim a ‘rare planetary alignment’ or ‘supermoon’ every day.
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